Area of Figures

import java.util.Scanner;

public class P14 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String figure = scanner.nextLine();


        if (figure.equals("square")){
            double side = Double.parseDouble(scanner.nextLine());
            System.out.println(side*side);

        }else if (figure.equals("rectangle")){
            double widght = Double.parseDouble(scanner.nextLine());
            double lenght = Double.parseDouble(scanner.nextLine());
            System.out.println(widght*lenght);

        }else if (figure.equals("circle")){

            double radius = Double.parseDouble(scanner.nextLine());
            System.out.println(3.14*radius*radius);

        }else if (figure.equals("triangle")){
            double side = Double.parseDouble(scanner.nextLine());
            double height = Double.parseDouble(scanner.nextLine());
            System.out.println(side*height/2);

        }
    }
}